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Re: st: Log Transformation of Variable


From   Gordon Hughes <G.A.Hughes@ed.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Log Transformation of Variable
Date   Sun, 27 Feb 2011 11:28:40 +0000

It is completely unclear to me - probably other readers - what you are trying to do mathematically. You refer to "multiplying" by (-log -e) but log is a function while -log(x)-e is a composite transformation of x. Equally there is no mathematical operator that corresponds to [-log-e](x). Get the mathematics right and Stata can help, but it is not designed to sort out nonsense mathematics.

Gordon Hughes
g.a.hughes@ed.ac.uk

------------------------------

Date: Sat, 26 Feb 2011 12:04:48 -0500
From: Melissa King <melissakng@gmail.com>
Subject: st: Log Transformation of Variable

Good Morning,

I have a dataset that I would like to transform by multiplying the
dependent variables by -log - e, or in other words, the negative
logarithm minus its base. Despite searching this forum and the
Internet, I have been unable to find any information on how to "tell"
Stata to do this. I am able to transform my variable by multiplying it
by negative log:

generate transformed_dep_variable = -log(dep_variable)

However, Stata errors out when I try to communicate -(log+e), because
it no longer recognizes log as a function when I type this in:

generate transformed_dep_variable = -(log+e)(dep_variable)

Do any long-time Stata users have any suggestions?

Thank you in advance for your help!

All best,

Melissa King

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